Simple Explanation
Population density सीधे population के proportional होती है जब area constant हो। यदि population आधी हो जाए और area same रहे, तो \(Population/Area\) ratio भी आधा हो जाएगा। इसलिए चौथा विकल्प सही है। Density double या unchanged नहीं रहेगी। परीक्षा में fixed area पर population के proportional change को density में समान proportional change से जोड़ें। / Population density is directly proportional to population when area is constant. If population falls by half and the area stays the same, the \(Population/Area\) ratio also becomes half. Therefore, the fourth option is correct. Density will not double or remain unchanged. In examinations, remember that with fixed area, proportional changes in population produce the same proportional changes in density.
